Nitrates are compounds that contain nitrogen, an element essential for life.

硝酸盐中含有氮，而氮是维持生命的必要元素。

youdao

"If you have an imbalance, or literally too much nitrogen and too much phosphorous getting into those systems, you can essentially deplete the oxygen in that water.

VOA: standard.2010.08.04

So, if we took the case of nitrogen, if we add an electron to nitrogen and go to n minus, we find that the change in energy is 7 kilojoules per mole.

如果我们以氮为例，如果我们给氮增加个电子令它变成-1价的氮，我们会发现能量的变化是，7，千焦每摩尔。

麻省理工公开课 - 化学原理课程节选

So, for example, down here I wrote that it was n 2 and that it was h 2, but when I re-wrote the molecules up here, you saw that it's an h h single bond where it's a nitrogen-nitrogen triple bond.

比如，在这下面我写的是氮分子2,而这个是氢分子，但我在上面把这些分子的形式改写了，大家可以看到,这是一个氢与氢之间的单键，含一个氮与氮之间的三键。

麻省理工公开课 - 化学原理课程节选

Today nearly half the nitrogen atoms in the proteins of an average human being's body came at some time or another through an ammonia factory.

ECONOMIST: The story of man's staple food

The plan was for OCO's measurements to be synchronised with an analysis of ozone, nitrogen dioxide, methane and other greenhouse gases by the rest of the fleet.

ECONOMIST: Greenhouse gases

The bodies of Mr Cain, a father of one from Whitehill, and Mr Clarke, from Liss, were found in an apple storage area where nitrogen is used to preserve fruit.

BBC: Blackmoor Estate deaths: Tributes paid to farm workers